Casing for circular piston engines



NOV. 27, 1934. SIEPER 1,982,027

I CASING FOR CIRCULAR PISTON ENGINES Filed July 21, 1933 ai wl Patented Nov. 27, 1934 UNITED STATES PATENT orrics Appiication July 21, 1933, Serial No. 681,651 In Germany August 8, 1931 4 Claims.

This invention relates to geared engines and by engines it is to beunderstood that there is included both motors and pumps.

More especially the invention relates to a cas- 5 ing or housing for such engines.

In the ordinary construction of geared pumps and motors it is customary to make the housing from a block of metal, either cast or forged, which is bored out to accurately fit the gears at the parts remote from the meshing portion of such gears. It is not only difiicult and expensive to thus construct such housings because of the extreme accuracy required but housings of this construction rapidly deteriorate because of the wear 5 of the gear faces and of the bore of the housing itself so that fluid is allowed to flow between the gears and those parts of the housing which should be in contact with the gears. Because of this rapid wear it is in practice impossible, under 30 the present construction, to maintain such an engine in a high degree of efiiciency.

One important object of the present invention is to provide a novel construction of housing for such engines whereby, whenever wear does occur, the housing will, in a practically automatic manner, take up such wear so that it will constantly remain fluid tight in its relation to the gears.

A second important object of the invention is to provide a novel form of such housing which may be made of a strip of spring metal so that no accurate boring operations are necessary in the construction of the housing and thereby great economy is effected in manufacture.

With the above and other objects in view, as

will be hereinafter apparent, the invention consists in general of certain novel details of construction and combinations of parts hereinafter fully described, illustrated in the accompanying drawing and specifically claimed.

In the accompanying drawing, like characters of reference indicate like parts in the severa views, and:-

Figure 1 is an elevation of the cylinder of an *5, engine constructed in accordance with this invention, the front head of the cylinder being removed so as to better show the construction of the novel housing.

Figure 2 is a side elevation of such an engine. Figure 3 is a view somewhat similar to Figure 1 but showing a modified arrangement of the housing.

Figure 4 is a section on the line IVIV of Figure 3 to an enlarged scale and having certain parts broken away.

In the construction of an engine in accordance with this invention there is provided themain or body portion A carrying the rear head 01. This body portion has the usual bearings A one of which supports the main shaft C. This engine is 1 provided with the usual meshing gears c as clearly 1 shown in Figures 1 and 3. Also the engine has a front head e. In the form of the device shown in Figure 1 there is wrapped around the gears c a spring metal band a, several convolutions being wrapped in this manner. As will be observed from this figure the wrapping of this band forms an elongated ring and the ends of the band overlap at one side of the ring and are held by the bolt and nut b. It is a well-known law of spring rings that they tend to assume a circular shape even when distorted as by elongation. By reason of this law the ends of the ring will closely fit those portions of the gears remote from their meshing portions regardless of the wear on the band or gears, the only requisite being that the band be not held against tendency to assume circular shape. This band is preferably made slightly wider than the face of the gears so as to allow a certain lateral play of such gears if desired. As the band has been applied to the gears it is q clamped between the heads (1 and e by means of the usual bolts e.

In the form of the invention shown in Figures 3 and 4 two such rings are provided, the inner ring it being substantially identical with the ring a of the previous form. Outside of this inner ring is a second similar ring g which, at its ends, bears against the outer surface of the end portions of the ring h. These two rings are arranged to be clamped at one side by a single bolt b. As will be observed from Figure 4 the ring 9 is slightly Wider than the ring h to provide play as indicated at i while the gears themselves are still narrower to provide play as indicated at J. The ring ,1] also tends to assume the circular form and thus assists in keeping the ring it in proper contact with the gears 0.

With this construction wear may be taken up at any time by simply loosening the bolts e so as to allow the ring or rings to tend toward a more nearly circular form with the result that the end portions of such ring or rings are drawn toward each other thus ensuring proper contact between the housing and the gears c.

There has thus been provided a simple and efii- -1- cient device of the kind described and for the purpose specified.

It is obvious that many minor changes may be made in the form and construction of the in- 1 vention without departing from the material principles thereof. It is not therefore desired to confine the invention to the exact forms herein shown and described, but it is desired to include all such as properly come within the scope claimed.

What is claimed is:-

1. In an engine having geared piston elements, a housing including an elongated elastic ring surrounding the peripheral portions of said elements and bearing at its ends against respective gear elements, said housing ring consisting of a band of spring metal wound'upon itself in a plurality of convolutions.

, 2. In an engine having geared piston elements,

surrounding the peripheral portions of said elements and bearing at its ends against respective gear elements, said outer ring hearing at its ends against the outer surface of the inner ring at the ends of the latter and spaced from said inner ring at its sides, said outer ring having a width greater than the width of the inner ring and said inner ring having a Width greater than the Width of the gears.

4. In an engine having geared piston elements, a housing including a pair of elongated elastic rings nested one Within the other, the inner ring surrounding the peripheral portions of said elements and hearing at its ends against respective gear elements, said outer ring hearing at its ends against the outer surface of the inner ring at the ends of the latter and spaced from said inner ring at its sides, said outer ring having a width greater than the width of the inner ring and said inner ring having a width greater than the Width of the gears, each of said housing rings consisting of a band of spring metal wound upon itself in a plurality of convolutions. v

FRITZ SIEPER. 

